Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e0b1fb12fc20d92e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:00 Authoring application: Microsoft Excel First seen: 2021-10-12
MD5: bbca4f35807c8e6ba42f99d35aabc82d SHA-1: f2832ebf23082d51c777b336fe4dbf898fe08c45 SHA-256: e0b1fb12fc20d92e98430c30339cd57e9b2553e6ca4b7b9ff2f8d95135042d91
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel document containing Excel 4.0 macros, specifically an Auto_Open macro. This macro is configured to execute dangerous formula APIs, including the RUN function, indicating it is designed to launch an external process. The presence of the Auto_Open macro and the use of dangerous functions strongly suggest the intent to download and execute a second-stage payload.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6883 bytes
SHA-256: 2d75c456af53373a61960af28102b69bb2bec810d92fc684ba5ce7d642ac6719
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  oWWPGvoUgfC
' 0018     24 LABEL : Cell Value, String Constant - ASftEVZku len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C184 
' 0018     23 LABEL : Cell Value, String Constant - BFySQoJv len=0 
' 0018     26 LABEL : Cell Value, String Constant - cDVbSnrYUtF len=0 
' 0018     27 LABEL : Cell Value, String Constant - EaATKykympLh len=0 
' 0018     24 LABEL : Cell Value, String Constant - EEWsxvTxP len=0 
' 0018     20 LABEL : Cell Value, String Constant - ELYEj len=0 
' 0018     23 LABEL : Cell Value, String Constant - HyJelhgl len=0 
' 0018     24 LABEL : Cell Value, String Constant - IbFznjTHA len=0 
' 0018     22 LABEL : Cell Value, String Constant - JvwRSgP len=0 
' 0018     27 LABEL : Cell Value, String Constant - KLlZhJmFSmEI len=0 
' 0018     22 LABEL : Cell Value, String Constant - kRiRgGp len=0 
' 0018     25 LABEL : Cell Value, String Constant - LUYzDTDPbL len=0 
' 0018     26 LABEL : Cell Value, String Constant - ndyWUQzDIpw len=0 
' 0018     24 LABEL : Cell Value, String Constant - PJpsCoGzz len=0 
' 0018     20 LABEL : Cell Value, String Constant - RZvxf len=0 
' 0018     21 LABEL : Cell Value, String Constant - SerluS len=0 
' 0018     27 LABEL : Cell Value, String Constant - tduggfcPzOza len=0 
' 0018     27 LABEL : Cell Value, String Constant - wlAZropzxnHb len=0 
' 0018     22 LABEL : Cell Value, String Constant - wSScxzk len=0 
' 0018     21 LABEL : Cell Value, String Constant - XeyTZU len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST

... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.